Cast: deliver video frames on the IO thread

content/renderer/pepper/pepper_media_stream_video_track_host.h

Index: content/renderer/pepper/pepper_media_stream_video_track_host.h
diff --git a/content/renderer/pepper/pepper_media_stream_video_track_host.h b/content/renderer/pepper/pepper_media_stream_video_track_host.h
index 36587068f1a05e3b128ec4ede6e468e9af05f921..b985b386b0165e4d9aeb106b0a20416c5213ce24 100644
--- a/content/renderer/pepper/pepper_media_stream_video_track_host.h
+++ b/content/renderer/pepper/pepper_media_stream_video_track_host.h
@@ -6,6 +6,7 @@
 #define CONTENT_RENDERER_PEPPER_PEPPER_MEDIA_STREAM_VIDEO_TRACK_HOST_H_
 
 #include "base/compiler_specific.h"
+#include "base/memory/weak_ptr.h"
 #include "content/public/renderer/media_stream_video_sink.h"
 #include "content/renderer/media/media_stream_video_source.h"
 #include "content/renderer/pepper/pepper_media_stream_track_host_base.h"
@@ -54,9 +55,8 @@ class PepperMediaStreamVideoTrackHost : public PepperMediaStreamTrackHostBase,
   // Sends frame with |index| to |track_|.
   int32_t SendFrameToTrack(int32_t index);
 
-  // MediaStreamVideoSink overrides:
-  virtual void OnVideoFrame(const scoped_refptr<media::VideoFrame>& frame)
-      OVERRIDE;
+  void OnVideoFrame(const scoped_refptr<media::VideoFrame>& frame,
+                    const media::VideoCaptureFormat& format);
 
   // MediaStreamVideoSource overrides:
   virtual void GetCurrentSupportedFormats(
@@ -119,6 +119,8 @@ class PepperMediaStreamVideoTrackHost : public PepperMediaStreamTrackHostBase,
   class FrameDeliverer;
   scoped_refptr<FrameDeliverer> frame_deliverer_;
 
+  base::WeakPtrFactory<PepperMediaStreamVideoTrackHost> weak_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(PepperMediaStreamVideoTrackHost);
 };